<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<div>
  <input type="text" v-model="n1">
  <input type="text" v-model="n2">
  <input type="button"value="加" @click="f(1)">
  <input type="button"value="减" @click="f(2)">
  <input type="button"value="乘" @click="f(3)">
  <input type="button"value="除" @click="f(4)">
  <h1>结果：{{result}}</h1>
</div>
<script src="js/vue.min.js"></script>
<script>
  let v=new Vue({
    el:"body>div",
    data:{
      result:"",
      n1:"",
      n2:""
    },
    methods:{
      f(x){
        switch (x){
          case 1:
          v.result=v.n1*1+v.n2*1;
            break;
          case 2:
          v.result=v.n1-v.n2;
            break;
          case 3:
            v.result=v.n1*v.n2;
            break;
          case 4:
            v.result=v.n1/v.n2;
            break;

        }
      }
    }
  })
</script>
</body>
</html>